A motorist was clocked driving at more than 100mph through a 40mph zone in roadworks on the A47.
The driver was recorded doing 101mph by average speed check cameras at Blofield, where the road was being widened to create a dual carriageway.
Traffic past the roadworks was restricted to a narrow single lane lined by cones and barriers.
It is one of a number of 40mph zones on the A47 and A11 around Norwich which have been in place since 2025 to allow three major road upgrades to take place.
As well as the dualling near Blofield, the others are near Honingham and at Thickthorn.
The 101mph driver was one of more than 1,900 motorists who have been caught speeding through the roadworks, according to new figures obtained from Norfolk Constabulary under the Freedom of Information Act.
Other cases involved a motorist doing 83mph in a 40mph area on the A11 near Ketteringham and 74mph on the same road near Hethersett.
The temporary speed restrictions have been in place on the A47 between Blofield and North Burlingham, and North Tuddenham and Easton, to allow them to be dualled, and on the A11 and A47 near Thickthorn, while the interchange is being upgraded.
The work between Blofield and North Burlingham, where the 101mph driver was caught, has since been completed.
Work in the other two areas is ongoing, with restrictions expected to last for another year.
Since 2025, across all the areas covered by the cameras, 1,925 drivers have been caught speeding.
Most offences were through the Blofield to North Burlingham stretch.
In that area, 527 speeding drivers were fined and given penalty points, 427 did speed awareness courses and 164 were prosecuted.
Of the total number caught, 782 have paid fines and had penalty points put on their licence, while 792 have attended speed awareness courses.
A further 233 have been prosecuted, while 118 cases are not yet complete.
The A11 near Ketteringham was another hot spot for speeding, with 227 drivers fined, 60 prosecuted and 296 attending speed awareness courses after being caught in just two months of 2025 - November and December.
Norfolk police said motorists who flouted the limits - put in place for safety reasons during months of dualling work on the major county road - had put the lives of road workers, along with fellow drivers, at risk.
Inspector James Shepherd, of Norfolk Constabulary’s roads policing team, said: "Roadworks present unique hazards, including narrowed lanes, changing layouts, temporary traffic management and workers operating close to live traffic.
"Speed limits are put in place to protect both the workforce and other road users.
"Drivers who exceed these limits have less time to react to hazards, require longer stopping distances and are more likely to lose control, particularly on temporary road surfaces.
"As speed increases, so does the risk and severity of any collision.
"The most extreme offences detected are particularly concerning.
"Speeds of up to 101mph through road works show a complete disregard for the safety of road workers and fellow motorists and create an unacceptable risk of serious injury or death."
Fines are paid to central government, not Norfolk Constabulary.
The penalties imposed depend on the speed involved and can include fixed penalties, court fines, penalty points or disqualification.
Insp Shepherd said: "Speed enforcement in road works is about keeping people safe, not generating revenue."
Chris Griffin, programme manager for National Highways, said: "Safety is and will always be our number one priority and the average speed limits are in place to protect our workforce and motorists.
"We are committed to delivering a safer road network and our dualling projects at both Tuddenham and Blofield will deliver just this—as well as reducing congestion and bringing many economic benefits."
The newly-dualled road between Blofield and North Burlingham opened earlier this year.
Work to dual the road between Easton and North Tuddenham is due to be completed by summer next year.
The Thickthorn revamp, which will see new underpasses beneath the existing A11 and A47 roads - so much of the traffic can avoid the roundabout - is due to be completed by spring 2028.
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